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Kidwellite With Rockbridgeite & Beraunite

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CLB140656

Kidwellite With Rockbridgeite & Beraunite

ex coll. Uta Müller
Rare Mineral

Description Tabs

Description
Locality: 
Coon Creek Mine, Shady, Polk County, Arkansas, United States of America
Size Range: 
Miniature (4.5-7 cm)
Size: 
6.5 × 4.8 × 2.9 cm
Description

Botryoidal and crusty aggregates of grayish-green kidwellite on matrix with black rockbridgeite and a little beraunite. Kidwellite is a very rare phosphate.

Mineral Data
What's on the rock

Kidwellite

Formula: 
NaFe3+9(PO4)6(OH)11·3H2O
Strunz: 
8.DK.20
Hardness: 
3.0
Streak: 
yellow
Type Locality: 
Fodderstack Mountain, Norman, Montgomery Co., Arkansas, USA

Rockbridgeite

Formula: 
Fe2+Fe3+4(PO4)3(OH)5
Strunz: 
8.BC.10
Crystal System: 
Orthorhombic
Hardness: 
3.5 - 4.5
Type Locality: 
Midvale Mine, South Mountain, Midvale, Rockbridge Co., Virginia, USA

Beraunite

Formula: 
Fe2+Fe3+5(PO4)4(OH)5·6H2O
Group Parent: 
Beraunite Group
Strunz: 
8.DC.27
Crystal System: 
Monoclinic
Hardness: 
3.0 - 4.0
Type Locality: 
Hrbek Mine, Svatá Dobrotivá (St Benigna), Beroun (Beraun), Central Bohemia Region, Bohemia (Böhmen; Boehmen), Czech Republic

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